Braking mechanism



April 27, 1926.

B. D. STEVENS BRAKING uzcxumrsl Filed larch 26, 1925 3 Sheets-Sheet 1 April 27, 1926.

v B. D. STEVENS BRAKING wscrmmsu mid larch 26, 1923 s Sheets-Sheet 2 gym :5

' April 27, 1926. 1,582,553

B. D. STEVENS smxma MECHANISM r11: larch 2e, 1923' 3 Sheet-Sheet s nivrrsn srA'rss rarest series,

BURT D. STEVENS, F EVANSTON,

ILLINOIS, AS$IGNOB T0 BEIEHLE PRINTING PRESS "8!, MANUFACTURING (30., 0F CHICAGO, ILLINOIS, A COBPGRATION 01E ILLKNOIS nnanrne MECHANISM.

Application filed. March 26, 1923; serial No. 627,570.

To all whom it may concern. Be it known that I. BURT D. STEVENS, a (1113175631 of the United States, residing at Evanston, in the county of Cook and Statev of Illinois, have invented certain new and useful Improvements in Braking Mechanism, of which the following is a specification.

ihis invention relates to printing press control mechanism and more particularly to power transmission and brake mechanism for printing presses. It isan improvement over the arrangement'disclosed in the application Serial No. 526,?64, filed by Edward Cheshire, on January 3, 1922.

One object of the invention is to provide sin'iple, durable and efficient brake mechanism for a printing press whereby the operation of the press may be quickly interrupted and the moving parts thereof stopped.

l rnother object is to provides belt drive ctween the motordriven shaft and the main 1 1 sh aft of the printing. press whereby thetaut- 2 use may be properly maintained under all operating vconditions. V v Another object is to provide a power transmission system for printing presses in which the'parts are accessible to facilitate any changes or repairs and which at the same. time are protected to prevent injury to theoperator. 7

Another object is to provide driving'and iral ze mechanism for a printing press adapted to meet all of the requirements for succcssful commercial use.

These and other objects are accomplished by means of the arrangement disclosed on the accompanying sheets of drawings, in which c Figure l is a fragmentary side elevation of a vertical type of printing press embodying my invention; I v

Figure 2 is a fragmentary enlarged side elevation of the same press; c

rigure 3 is a fragmentary end elevation of the arrangement shown in Figure 2; and

Figure 4 is a fragmentary detail plan view of a motor drive pulley and associated parts shown at the extreme left hand side of Figure 2. i

The various novel features of the invention will be apparent from the following description and drawing and will be particularly pointed out in the appendedclaims.

R f rring t h g re 0f the clrawii s,

it will be noted that my invention is illustrated in connection with a vertical type of printing press including a base frame 10,

movement.

The main shaft 13 from which the various parts of the press are driven, is provided with a pulley 14 which is driven by a belt 15 receiving its motion from a driving pulley 16 and passing around idler pulleys 17 and 18 to be referred to more 1n detail hereinafter.

The driving pulley 16 is mounted upon one end of a motor driven shaft 19 which rotates in abearing 20 formed in one part of .a bracket 21, secured to the press frame 10. A hearing cap 22 completes the bearing 20 and includes an integrally formed arm 23 carrying a pin 24 upon which'a conr bined belt and pulley retainer, and guard 25 is pivotally mounted. Not only does this guard 25 cover the top of the pulley 16 and the associated portion of the belt 15,but said guard includes an inner side plate 26 and an outer side plate 27, which not only act as a safety guard for the operator, but the outer plate 2'? also serves the function of retaining the belt 15 on the pulley 16 and retaining the pulley on the shaft 19. No other means is provided for preventing endwise removal of the pulley 15 from the motor drive shaft 19. Accordingly, it is a very simple matter to withdraw the driven pulley 16 from the shaft 19' and apply the same or another pulley to said shaft if it is desired to vary the speed at which the press is to be operated. It is simply necessary to swing the guard 25 upwardly and pull outwardly upon the pulley 16, it being assumed, of

' course, that the belt 15 previously has been slackened.

The tautness of trolled by'the main hand operated lever'28 which is pivotally mounted upon a stud 29 passing through a side plate 30 and into the bed frame 10 of the press. This lever 28 has mounted thereon the idler pulley 17 which cooperates-with the idler pulley 18, the latter of which is pivotally mounted upon a pin 31 carried in the upper end of an arm 32 pivotally mounted upon a stud 33,

the driving belt is conthreaded into the main frame of the press. The arm has a forwardly extending projection which is operatively connected to a spring pressed rod having a spring 36 coiled therearound and operating in a manner to yieldably press the idler pulley 18 to the left as viewed in li igures 1 and 2. From the arrangement thus far described itwill be appreciated that when the main operating hand lever 28 swung to the right from the position :hown in Figure 1. to the position shown in Figure 2, that the idler pulley 1'? will tollow for thrusting the belt into engagement with the other idler pulley 18, the degree of tautness of the belt being controlled by the tinal position which the lever 28 is given and the action of the spring 86 upon the idler pulley 18. In this connection, the lever carries a detent 37 which is adapted to engage the teeth 38 of a segment 39 forming a partof a bell crank lever pivotally supported at the point 40. By means of the tooth segment 39 which controls the adjusted position of the idler pulley 17, and the spr g 30 which operates upon the other idler pulley 18, the degree of tautness of the belt 15 is controlled, and any inaccurate positioning oi the idler pulley 17 will be compensated for by the spring 36 operating upon the other idler pulley 18.

is mentioned above, the tooth segment 39 forms a part of the bell crank lever and more particularly terms part of one arm er of the bell crank lever having its other arm l3 vertically arranged and normally held by a locking member A in the form of a bell crank lever pivot-ally supported at the point 4 5. The vertical arm d6 of this bell crank lever has pivotally connected thereto a weightet dog l", the counter-clockwise rotation of which is limited by a pin l8 carried on the vertical arm 46. Under certain predetermined conditions in the operation of the press, the weighted dog l? is eng iced by an extended plun 'cr member ill during a vertical movement of the latter. with the result that the arm it-l of the bell crank lever i2 is released from the looking member ll, causing sa id bell crank lever to rotate in a counterclockwis direction upon its pivot point it) as viewed in Figures 1 and thereby releasing the detent 37 and the main hand operated lever 28 which, under the tension of the driving belt are swung to the left on the pivot point As a result thereof no i'urther driving power t r itted from the driving pulley 16 to t e in shaft 13 of the press.

llcre'otore the operating parts of the pre s lave been permitted to continue to move through their regular cycle until said parts a result of friction, have come to astate of rest. However, said continued movement of the operating; parts of the press, a fter the driving connection no longer is etl'ective. cau es a waste of considerable time. Jtccordii V y, I have provided means for not only slackening the belt. but for stopping the operation ot the p. i: almost instantaneously. This means takes the form oi a cam operated brake. In this counection, a brake shoe is provided to cooperate with a lly wheel 51 mounted upon the main press shaft the brake shoe being carried by a brake head mounted upon a pin a; carried in one end of a lever 53. suitably supported by a pin One end of the lever 5-). namely, the left hand end, as shown in Figures 1 and 2. is provided with an inclined surtare or cam which cooperates with the lower end of an arm 50 integrall formed with the main hand operated control lever 28 anl pivoted upon the stud 29. The in its counterclockwise rotation pin 5-1- by a suitably supported mounted set screw 5?.

With respect to the operation of the brake, it will be understood that when the detent 5'! is released from toothed segment 25!) either as a result of the manual operation or automatic operat 1, the main lever will rotate about its pivotal support 2!) in a countercloclnvise direction shown in Figures 1 and 2 not only to slackeu the belt 15 and thereby render ineli'ective the driving connection between the driving pulley 1 and the main shaft pulley l-l but also to cause the lover end 01 the projection it; to pass into engagement with and move npwar lly upon the cam 55 to thrust the brain shoe 50 into eng QCIDODt with the fly wheel 5-1 for causing the operating parts oi the press to (some to substantially an i1nmediate stop. The cooperative action of the projection 56 and cam intensifies the braking action. In this way the operating parts of the printing press may be eliicientlv stopped and a great deal oi time saved thereby. To release the brake it is merely in 'e. ary to swing the hand operated lever 28 in a clockwise direction, as viewed in Figures 1 and 2, until the projection 56 moves out of engagement with the cam 55. thereby releasing the brake let d and per mittiug it to lower out of engagement with the fly wheel 51 by gravity action.

it is my intention to cover all modifications of the invention falling within the spirit and scope of the following claims.

l claim:

1. In a printing pr a press operating shli't.

about the iMljllStilbl) power transmitting: lielt' the? I pluralitv o i idler pulleys ior rentwlliu; the

tautnc'ss of said belt. an operating lever carrying one of said pulleys and controlling the operation ofthe prt' nri and braking means controlled b s: .1 lever.

cam lever is limited operation of the press,

' power trensin printing press, the combination (its press opera iiw she-l t, a driving shett, a power transmitting belt therebetween, e

plurality of iel uilleys for controlling the oi" su' rtlt, :ui operating U i one said pulleys and contra t l operntixn o the pres, end a 3 her associated v ith s operating nde ted to be i i press. r 8,111 e printin ion of o press opera ing e 1 plurality oi idl triutness of saic one being operetively connected to said operating lerer for applying said broke member. L. In a printing e of operating lever adapted to be applied for stopping the operation ot the press, a. let or to which said brolte member is connected having a cam, said cem lever being engege'l and operated directly by said control lever for applying the brake.

5. In e i 'irinting press, the combination of a press mereting shaft, 2 driving shaft, 21 be tthrough which po wer is transmitted from said dri ng shaft to said press operating siett, means for controlling the tentness of said belt including a lever, and brake means disconnected "from said lever under normal running conditions adapted to stop the press.

6. In n printing press, the combination of press operating shaft, a, drivng shaft, belt {or transmitting; power between said shafts, means for controlling the toutness of said belt including a lever, and a braille nan-mall disconnected from said lever adapted to stop the press when said belt becomes ineliectir'e -tor transmitting power "from said driving shaft to said press operat ing shaft.

7. in a printin combination of i 5% a press 01 erating slmtt, it .riving shaft, a belt for transmitting power therebetween, and a plurality of cooperating idler pulleys operatively ass cieted with said belt where by the tautness thereof is controlled.

8. in a printing press, the co 'ibinzition of a press operating she'ft, a driving shaft, ii belt ior transmitting power therebetween, a plurality; of cooperating idler pulleys operat-ivel associated with said belt'where- 3; the taut ess thereof is controlled, and

brake means whereby the operation of said aress is stopped upon a predetermined z.- 

